Snort rule matching denial of service
|snort-rule-matching-dos (31430)||Medium Risk|
Snort is vulnerable to a denial of service caused by a vulnerability in the rule matching algorithm. A remote attacker could send a specially-crafted packet to cause the rule matching algorithm to consume resources and cause a decreased packet detection rate or a denial of service.
Denial of Service
Upgrade to the latest version of Snort (126.96.36.199 or later), available from the Snort Web site. See References.
For Gentoo Linux:
Refer to GLSA 200702-03 for patch, upgrade, or suggested workaround information. See References.
For Mandriva Linux (snort):
Refer to MDKSA-2007:051 for patch, upgrade, or suggested workaround information. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
- Snort Web site: Snort.org.
- BID-21991: Snort Backtracking Denial of Service Vulnerability
- CVE-2006-6931: Algorithmic complexity vulnerability in Snort before 2.6.1, during predicate evaluation in rule matching for certain rules, allows remote attackers to cause a denial of service (CPU consumption and detection outage) via crafted network traffic, aka a backtracking attack.
- GLSA-200702-03: Snort: Denial of Service
- MDKSA-2007:051: Updated snort packages fix DoS vulnerability
- OSVDB ID: 32096: Snort Rule Predicate Rule Matching Backtrack DoS
- SA23716: Snort Rule Matching Backtrack Denial of Service Vulnerability
- SECTRACK ID: 1017508: Snort Rule Matching Complexity Lets Remote Users Deny Service via Backtracking Attacks
- Gentoo Linux
- MandrakeSoft Mandrake Linux 2006 X86_64
- MandrakeSoft Mandrake Linux 2006
- MandrakeSoft Mandrake Linux 2007
- MandrakeSoft Mandrake Linux 2007 X86_64
- MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
- MandrakeSoft Mandrake Linux Corporate Server 4.0
- MandrakeSoft Mandrake Multi Network Firewall 2.0
- Snort Snort 2.4.3
Jan 11, 2007
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.